Lec10_drobny_11-1 - Lecture 10 G Q and K Reading Zumdahl...

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Lecture 10: Δ G, Q, and K • Reading: Zumdahl 10.10 (on exam), 10.11(not on exam) • Recommended Problems (not on exam): 10.65, 10.67, 10.71, 10.75, 10.77 • Outline – Relating Δ G to Q – Relating Δ G to K
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Relating Δ G to Q (cont.) • Given this relationship Δ S = R ln (V fnal /V initial )
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Relating Δ G to Q (cont.) This equation tells us what the change in entropy will be for a change in concentration away from standard state. Entropy change for process occurring under standard conditions Additional term for change in concentration. (1 atm, 298 K) (P 1 atm)
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Relating Δ G to Q (cont.) How does this relate to Δ G?
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Relating Δ G to Q (cont.) Generalizing to a multicomponent reaction:
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Relating Δ G to Q (cont.) Generalizing to a multicomponent reaction:
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Relating Δ G to Q (cont.) Generalizing to a multicomponent reaction: Where for a gas phase reaction:
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An Example • Determine Δ G rxn at 298 K for: C 2 H 4 (g) + H 2 O(l) C 2 H 5 OH(l) where P(C 2 H 4 ) = 0.5 atm (others at standard state) Δ rxn = -6 kJ/mol (from Lecture 9)
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An Example (cont.) C 2 H 4 (g) + H 2 O(l) C 2 H 5 OH(l) Δ G rxn = -6 kJ/mol + (8.314 J/mol.K)(298K)ln(2) = -4.3 kJ/mol
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Which of the following processes is spontaneous?
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This note was uploaded on 01/18/2012 for the course CHEM 152A taught by Professor Chiu during the Fall '12 term at University of Washington.

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Lec10_drobny_11-1 - Lecture 10 G Q and K Reading Zumdahl...

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